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Organic Gardening: Corn meal for black spot and powdery mildew

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Forum: Organic GardeningReplies: 7, Views: 187
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mesmerel
Des Moines, south of, WA
(Zone 8b)

April 11, 2007
2:10 PM

Post #3379633

I was reading a health column in the Seattle Times about a man who used cornmeal to help his toenail fungus and the doctor replied that he had heard from gardeners who used cornmeal on their roses to control black spot and powdery mildew because apparently cornmeal has some fungicidal properties.

Has anyone heard of this or tried it? On their roses, I mean.
ecrane3
Dublin, CA
(Zone 9a)

April 11, 2007
3:55 PM

Post #3380051

I've heard of people using baking soda to control black spot, etc, and I've heard of corn gluten (not the same thing as cornmeal) as a preemergent herbicide, but never heard of cornmeal as an anitfungal.
yotedog
Raleigh, NC

April 11, 2007
5:22 PM

Post #3380370

I've used it, and it seems to work, though not all the times. I rotate through a number of organic control methods, and sometimes there is no rhyme or reason why one works one season, but not the next. Check out the website (I hope I remembered it correctly...) http://www.dirtdoctor.com
soulgardenlove
Marietta, GA
(Zone 7b)

April 20, 2007
7:51 AM

Post #3410880

Happy birthday Mesmerel! :)

Susan

stephanietx

stephanietx
Fort Worth, TX
(Zone 8a)

April 21, 2007
10:55 AM

Post #3414980

I sprinkle cornmeal on the ground under my rose and crepe myrtle to help with powdery mildew. I also steep about 1 cup of cornmeal in a gal. of water, then use the "cornmeal tea" to spray on my crepe myrtle to get rid of powdery mildew. Haven't tried it on my rose bush, tho.

The cornmeal works on the toe fungus, but it's a slow acting cure.

Stephanie
Len123
Adrian, MO
(Zone 6a)

April 27, 2007
1:43 AM

Post #3435752

then why do farmers use a fungicide on corn?
perhaps the fungus has a preference for the corn over toenails or rose leaves. ???
yotedog
Raleigh, NC

April 27, 2007
9:00 AM

Post #3436255

Funny question Len123!!!! I suspect its because the fungus on corn is on the PLANT, not the ear of CORN. Just a guess...but you made me laugh, which is great!
Len123
Adrian, MO
(Zone 6a)

April 27, 2007
11:14 PM

Post #3439133

I think your right yotedog.

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